feat v1.14.0: per-space display settings, hand-drawn spaces, manual-testing checklist

- space dialog 'Display' section: room borders/names toggles, color+opacity,
  fill by zigbee signal or lights (tri-state: on/off/no-lights)
- draggable room name labels persisted as layout rl_<roomId>
- 'no image, outline by hand' space source with canvas orientation; image
  optional now; switching an existing space to draw detaches its plan
- demo/ synthetic-home harness lives in the repo (serve.mjs + smokes + icons gen)
- docs/TESTING.md checklist (same-commit update policy); self-run found and
  fixed: plan_url not detached on image->draw, _stateClass crash on states
  without entity_id; perf measured (162 devices ~14ms build)
- backend: SPACE_DISPLAY_SCHEMA validation (+test)

demo/gen_icons.mjs

@@ -0,0 +1,22 @@
+// Generate demo/srv/assets/icons.js: an { "mdi:name": "<svg path>" } map for every
+// mdi: icon referenced in src/ and demo/ (the demo host stubs <ha-icon> with it).
+import { readFileSync, writeFileSync, readdirSync } from 'node:fs';
+import * as mdi from '@mdi/js';
+
+const names = new Set();
+const scan = (dir) => {
+  for (const f of readdirSync(dir, { withFileTypes: true })) {
+    if (f.isDirectory()) { scan(`${dir}/${f.name}`); continue; }
+    if (!/\.(ts|json|html|mjs)$/.test(f.name) || f.name === 'icons.js') continue;
+    const txt = readFileSync(`${dir}/${f.name}`, 'utf8');
+    for (const m of txt.matchAll(/mdi:([a-z0-9-]+)/g)) names.add(m[1]);
+  }
+};
+scan('src'); scan('demo');
+const map = {};
+for (const n of [...names].sort()) {
+  const camel = 'mdi' + n.replace(/(^|-)(\w)/g, (_, __, c) => c.toUpperCase());
+  if (mdi[camel]) map['mdi:' + n] = mdi[camel];
+}
+writeFileSync('demo/srv/assets/icons.js', 'window.__ICONS=' + JSON.stringify(map) + ';\n');
+console.log('icons:', Object.keys(map).length, 'of', names.size, 'referenced');